Simple, i usually use the profit to re-invest it in other crypto.
If you look at the crypto market now, the downtrend of coins has started, bitcoin price now around $34k.
This is a good opportunity to buy and accumulate some top coins in the market, and hold them until we get a decent profit.
Re-investing profit in other coins is good decision, it is very good when their is different investment in cryptocurrency and it can be also risky to have just one investment because anything can happen in the market. In the case where their is no much fund to get other coins, when profits Comes from the first investment it can be used to get other coins.